Projector

ABSTRACT

A projector includes: a first solid-state light source device which includes a first solid-state light source emitting main excitation light, and a fluorescent layer converting main excitation light to light including a first color light component and a second color light component different from the first color light component, and emitting converted light; a second solid-state light source device which includes a second solid-state light source emitting a third color light component different from the first color light component and the second color light component; a light modulation device modulating the first color light component, the second color light component, and the third color light component in accordance with image information; a projection optical system projecting the modulated light components from the light modulation device as a projection image; and a third solid-state light source device which includes a third solid-state light source emitting auxiliary excitation light, wherein the fluorescent layer is configured such that auxiliary excitation light is input thereto in a direction different from a direction in which main excitation light is input, and the fluorescent layer is configured to convert auxiliary excitation light to light including the first color light component and the second color light component, and to emit converted light.

BACKGROUND

1. Technical Field

The present invention relates to a projector, and in particular, to aprojector using a solid-state light source.

2. Related Art

A projector is known which includes a single solid-state light sourcedevice emitting white light, a color separating and guiding opticalsystem separating light from the single solid-state light source deviceinto a red light component, a green light component, and a blue lightcomponent, a light modulation device modulating the respective colorlight components from the color separating and guiding optical system inaccordance with image information, and a projection optical systemprojecting the modulated light components from the light modulationdevice as a projection image (for example, see JP-A-2005-274957).According to the projector described in JP-A-2005-274957, the threecolor light components which are obtained by separating white lightemitted from the single solid-state light source device are used as thethree color light components (red light component, green lightcomponent, and blue light component) which are modulated by the lightmodulation device. Unlike a projector which includes three solid-statelight source devices, the light-emission efficiency (brightness per unitpower) or the temperature characteristic (the change of light amountwith change in temperature) does not differ between the solid-statelight source devices. As a result, the color balance of the projectionimage can be stabilized.

A projector is also known which includes a solid-state light sourcedevice emitting a red light component, a solid-state light source deviceemitting a green light component, a solid-state light source deviceemitting a blue light component, a light modulation device modulatingthe color light components from the respective solid-state light sourcedevices in accordance with image information, and a projection opticalsystem projecting the modulated light components from the lightmodulation device as a projection image (for example, seeJP-A-2002-268140). According to the projector described inJP-A-2002-268140, separate solid-state light source devices (asolid-state light source device emitting a red light component, asolid-state light source device emitting a green light component, and asolid-state light source device emitting a blue light component) areprovided for the respective color light components (red light component,green light component, and blue light component), and the three colorlight components which are respectively emitted from the threesolid-state light source devices are used as the three color lightcomponents (red light component, green light component, and blue lightcomponent) which are modulated by the light modulation device. Thus, theprojection image can be brightened compared to a projector whichincludes a single solid-state light source device.

However, according to the projector described in JP-A-2005-274957, sincewhite light including a red light component, a green light component,and a blue light component is generated from the single solid-statelight source device, unlike a projector which includes three solid-statelight source devices, a significant thermal load is concentrated on thesingle solid-state light source device. As a result, it is difficult tofurther brighten the projection image.

According to the projector described in JP-A-2002-268140, it isdifficult to make the three solid-state light source devicesrespectively emitting the red light component, the green lightcomponent, and the blue light component (the solid-state light sourcedevice emitting the red light component, the solid-state light sourcedevice emitting the green light component, and the solid-state lightsource device emitting the blue light component) the same light-emissionefficiency or temperature characteristic. For this reason, it isdifficult to stabilize the color balance of the projection image.

SUMMARY

An advantage of some aspects of the invention is that it provides aprojector capable of brightening a projection image compared to aprojector including a single solid-state light source device, andstabilizing the color balance of the projection image compared to aprojector including separate solid-state light source devices forrespective color light components.

A projector according to an aspect of the invention includes a firstsolid-state light source device which includes a first solid-state lightsource emitting main excitation light, and a fluorescent layerconverting main excitation light to light including a first color lightcomponent and a second color light component different from the firstcolor light component, and emitting converted light, a secondsolid-state light source device which includes a second solid-statelight source emitting a third color light component different from thefirst color light component and the second color light component, alight modulation device modulating the first color light component, thesecond color light component, and the third color light component inaccordance with image information, a projection optical systemprojecting the modulated light components from the light modulationdevice as a projection image, and a third solid-state light sourcedevice which includes a third solid-state light source emittingauxiliary excitation light. The fluorescent layer is configured suchthat auxiliary excitation light is input thereto in a directiondifferent from a direction in which main excitation light is input, andthe fluorescent layer is configured to convert auxiliary excitationlight to light including the first color light component and the secondcolor light component, and to emit converted light.

According to this projector, the two color light components (first colorlight component and second color light component) emitted from the firstsolid-state light source device and the one color light component (thirdcolor light component) emitted from the second solid-state light sourcedevice are used as the three color light components (red lightcomponent, green light component, and blue light component) which aremodulated by the light modulation device. Therefore, the thermal loadimposed on the respective solid-state light source devices can bereduced compared to a projector which includes a single solid-statelight source device. As a result, the projection image can be brightenedcompared to a projector which includes a single solid-state light sourcedevice.

According to this projector, two color light components (first colorlight component and second color light component) from among the threecolor light components (red light component, green light component, andblue light component) which are modulated by the light modulation deviceare generated by using a common solid-state light source (firstsolid-state light source and third solid-state light source). Therefore,the color balance of the projection image can be stabilized compared toa projector which includes separate three solid-state light sourcedevices for respective color light components.

As a result, the projector according to the aspect of the invention canbrighten the projection image compared to a projector which includes asingle solid-state light source device, and can stabilize the colorbalance of the projection image compared to a projector which includesseparate three solid-state light source devices for respective colorlight components.

According to this projector, the first solid-state light source deviceconverts two kinds of excitation light of main excitation light andauxiliary excitation light to light including the first color lightcomponent and the second color light component, and emits convertedlight. Therefore, the projection image can be further brightened.

The projector according to the aspect of the invention may furtherinclude a first collimation optical system parallelizing light emittedfrom the first solid-state light source device, a second collimationoptical system parallelizing light emitted from the second solid-statelight source device, a third collimation optical system having anoptical axis orthogonal to an optical axis of the first collimationoptical system and parallelizing auxiliary excitation light emitted fromthe third solid-state light source device, and an auxiliary excitationlight reflection optical element disposed in a region including anintersection between the optical axis of the first collimation opticalsystem and the optical axis of the third collimation optical system. Theauxiliary excitation light reflection optical element may directlytransmit light which is converted by the fluorescent layer and emittedfrom the fluorescent layer, and may reflect auxiliary excitation lightfrom the third solid-state light source device to input auxiliaryexcitation light to the fluorescent layer in an opposite direction to adirection in which main excitation light from the first solid-statelight source is input.

With this configuration, auxiliary excitation light is input to thefluorescent layer in the direction different from the direction in whichmain excitation light is input.

In this case, auxiliary excitation light which is converted to parallellight by the third collimation optical system is reflected as parallellight by the auxiliary excitation light reflection optical element, isfocused by the first collimation optical system, and is efficientlyinput to the light-emission region of the fluorescent layer. Therefore,it is possible to suppress the spread of the light-emission region dueto the third solid-state light source device being further provided.

The projector according to the aspect of the invention may furtherinclude a reflection-type polarizing plate located at the back of thefirst collimation optical system to directly transmit one polarizedcomponent from among polarized components included in light emitted fromthe first solid-state light source device and to reflect anotherpolarized component toward the fluorescent layer.

Meanwhile, when the light modulation device of the projector is a lightmodulation device which uses a liquid crystal light modulation device,in general, only one polarized component from among polarized componentsincluded in light is used for modulation, and another polarizedcomponent is not used for modulation. Thus, when a light source whichemits light including one polarized component and another polarizedcomponent is used as the light source of the projector, it is necessaryto remove another polarized component by an incidence-side polarizingplate, which causes degradation in light use efficiency.

In contrast, with the above-described configuration, another polarizedcomponent is returned again to the fluorescent layer and reflected bythe surface of the fluorescent layer. Thus, part of another polarizedcomponent is converted to one polarized component and reused, such thatlight use efficiency can be improved, and consequently the projectionimage can be further brightened.

With the above-described configuration, another polarized component isconverted to parallel light by the first collimation optical system.Then, parallel light is reflected by the reflection-type polarizingplate, is focused by the first collimation optical system, and isefficiently input to the light-emission region of the fluorescent layer.Therefore, it is possible to suppress the spread of the light-emissionregion due to the reflection-type polarizing plate being furtherprovided.

In the projector according to the aspect of the invention, mainexcitation light and auxiliary excitation light may be blue lightcomponents, the first color light component may be a red lightcomponent, the second color light component may be a green lightcomponent, and the third color light component may be a blue lightcomponent.

With this configuration, light including a red light component and agreen light component can be emitted from the first solid-state lightsource device by using the first solid-state light source and the thirdsolid-state light source emitting blue light components together.

Meanwhile, there is a problem in that a solid-state light source whichis used in a solid-state light source device emitting a green lightcomponent has relatively low light-emission efficiency compared to asolid-state light source which is used in a solid-state light sourcedevice emitting a red light component and a solid-state light sourcewhich is used in a solid-state light source device emitting a blue lightcomponent. In contrast, the projector according to the aspect of theinvention is configured such that green light components are generatedby using the first solid-state light source and the third solid-statelight source (emitting blue light components together) which have highlight-emission efficiency compared with a solid-state light source whichis used in a solid-state light source device emitting a green lightcomponent. Therefore, light-emission efficiency can be increasedcompared to a case where a solid-state light source device emitting agreen light component is used.

In the projector according to the aspect of the invention, the firstsolid-state light source, the second solid-state light source, and thethird solid-state light source may have the same temperaturecharacteristic.

With this configuration, with regard to all of the color lightcomponents, change in the light amount with change in temperature can bemade the same. Therefore, the color balance of the projection image canbe further stabilized.

In the projector according to the aspect of the invention, mainexcitation light and auxiliary excitation light may be ultravioletlight, the first color light component may be a red light component, thesecond color light component may be a green light component, and thethird color light component may be a blue light component.

With this configuration, light including a red light component and agreen light component can be emitted from the first solid-state lightsource device by using the first solid-state light source and the thirdsolid-state light source emitting ultraviolet light together.

A green light component is generated by using the first solid-statelight source and the third solid-state light source (emittingultraviolet light together) which have high light-emission efficiencycompared to a solid-state light source which is used in a solid-statelight source device emitting a green light component. Therefore,light-emission efficiency can be increased compared to a case where asolid-state light source device emitting a green light component isused.

Various kinds of fluorescent materials are known to efficiently convertultraviolet light, thus the selection width of a fluorescent material inthe fluorescent layer is widened.

In the projector according to the aspect of the invention, mainexcitation light may be one of a blue light component and ultravioletlight, auxiliary excitation light may be the other one of the blue lightcomponent and ultraviolet light, the first color light component may bea red light component, the second color light component may be a greenlight component, and the third color light component may be a blue lightcomponent.

With this configuration, light including a red light component and agreen light component can be emitted from the first solid-state lightsource device by using the first solid-state light source emitting oneof a blue light component and ultraviolet light and the thirdsolid-state light source emitting the other one of the blue lightcomponent and ultraviolet light.

A green light component is generated by using the first solid-statelight source (emitting one of a blue light component and ultravioletlight) and the third solid-state light source (emitting the other one ofthe blue light component and ultraviolet light) which have highlight-emission efficiency compared to a solid-state light source whichis used in a solid-state light source device emitting a green lightcomponent. Therefore, light-emission efficiency can be increasedcompared to a case where a solid-state light source device emitting agreen light component is used.

In the projector according to the aspect of the invention, thefluorescent layer may be formed of a layer containing a YAG-basedfluorescent material, a silicate-based fluorescent material, or aTAG-based fluorescent material.

The above-described fluorescent material can efficiently convertexcitation light (main excitation light and auxiliary excitation light)to light including a red light component and a green light component,and can emit converted light. Further, the fluorescent material itselfhas high reliability. Therefore, with the above-described configuration,the projection image can be further brightened, and thus a high-reliableprojector can be provided.

The YAG-based fluorescent material refers to a fluorescent material,such as (Y,Gd)₃(Al,Ga)₅O₁₂:Ce, which has a garnet crystal structure andis based on composite oxide of yttrium and aluminum.

The silicate-based fluorescent material refers to a fluorescentmaterial, such as (Ca,Sr,Ba)SiO₄:Eu, which is based on silicate salt(silicate) with various components introduced.

The TAG-based fluorescent material refers to a fluorescent material,such as Tb₃Al₅O₁₂:Ce, which has a garnet crystal structure and is basedon composite oxide of terbium and aluminum.

In the projector according to the aspect of the invention, a functionmay be provided to remove a yellow light component from light from thefirst solid-state light source device.

With this configuration, the yellow light component can be removed fromlight from the first solid-state light source device. As a result, colorreproducibility can be prevented from being deteriorated due to theyellow light component.

In the projector according to the aspect of the invention, a functionmay not be provided to remove a yellow light component from light fromthe first solid-state light source device. In this case, the yellowlight component which is included in light from the first solid-statelight source device can be positively used, and a brighter projectionimage can be projected.

In the projector according to the aspect of the invention, a functionmay be provided to remove main excitation light from light from thefirst solid-state light source device.

Meanwhile, in the projector according to the aspect of the invention,part of main excitation light emitted from the first solid-state lightsource device may transmit the fluorescent layer directly, which maycause degradation in color reproducibility or deterioration of the lightmodulation device.

However, with the above-described configuration, main excitation lightcan be removed from light from the first solid-state light sourcedevice. As a result, it is possible to suppress degradation in colorreproducibility or deterioration of the light modulation device due tomain excitation light.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be described with reference to the accompanyingdrawings, wherein like numbers reference like elements.

FIG. 1 is a plan view showing optical systems of a projector 1000according to a first embodiment.

FIGS. 2A to 2C are diagrams illustrating a first solid-state lightsource device 20, a third solid-state light source device 40, and asecond solid-state light source device 120 in the projector 1000according to the first embodiment.

FIGS. 3A to 3D are graphs showing relative light-emission intensity of afirst solid-state light source 24, a fluorescent layer 28, a thirdsolid-state light source 44, and a second solid-state light source 124in the projector 1000 according to the first embodiment.

FIG. 4 is a plan view showing optical systems of a projector 1002according to a second embodiment.

FIG. 5 is a plan view showing optical systems of a projector 1004according to a third embodiment.

FIG. 6 is a plan view showing optical systems of a projector 1006according to a fourth embodiment.

DESCRIPTION OF EXEMPLARY EMBODIMENTS

Hereinafter, a projector according to exemplary embodiments of theinvention will be described based on embodiments shown in the drawings.

First Embodiment

First, the configuration of a projector 1000 according to a firstembodiment will be described.

FIG. 1 is a plan view showing optical systems of a projector 1000according to a first embodiment.

FIGS. 2A to 2C are diagrams illustrating a first solid-state lightsource device 20, a third solid-state light source device 40, and asecond solid-state light source device 120 in the projector 1000according to the first embodiment. FIG. 2A is a sectional view of afirst solid-state light source device 20. FIG. 2B is a sectional view ofa third solid-state light source device 40. FIG. 2C is a sectional viewof a second solid-state light source device 120.

FIGS. 3A to 3D are graphs showing relative light-emission intensity of afirst solid-state light source 24, a fluorescent layer 28, a thirdsolid-state light source 44, and a second solid-state light source 124in the projector 1000 according to the first embodiment. FIG. 3A is agraph showing relative light-emission intensity of a first solid-statelight source 24. FIG. 3B is a graph showing relative light-emissionintensity of a fluorescent layer 28. FIG. 3C is a graph showing relativelight-emission intensity of a third solid-state light source 44. FIG. 3Dis a graph showing relative light-emission intensity of a secondsolid-state light source 124. The term “relative light-emissionintensity” refers to the characteristic regarding intensity of lightwith a certain wavelength at the time of emission when a voltage isapplied in the case of a solid-state light source and when excitationlight is input in the case of a fluorescent layer. In the graphs, thevertical axis represents relative light-emission intensity.Light-emission intensity with a wavelength having the maximumlight-emission intensity is set to 1. In the graphs, the horizontal axisrepresents a wavelength.

As shown in FIG. 1, the projector 1000 according to the first embodimentincludes a first illumination device 10, a second illumination device110, a color separating and guiding optical system 300, three liquidcrystal light modulation devices 400R, 400G, and 400B serving as a lightmodulation device, a cross dichroic prism 500, and a projection opticalsystem 600.

The first illumination device 10 includes a first solid-state lightsource device 20, a first collimation optical system 30, a thirdsolid-state light source device 40, a third collimation optical system50, a dichroic mirror 60, and a rod integrator optical system 70.

As shown in FIG. 2A, the first solid-state light source device 20 is alight-emitting diode which has a base 22, a first solid-state lightsource 24, a fluorescent layer 26, and a seal member 28. The firstsolid-state light source device 20 emits light including a red lightcomponent, a green light component, and a yellow light component (seeFIG. 3B which will be described below). The first solid-state lightsource device has lead wires and the like in addition to theabove-described constituent elements, but the lead wires and the likewill not be shown or described.

The base 22 is a base on which the first solid-state light source 24 ismounted.

The first solid-state light source 24 emits blue light component (thepeak of light-emission intensity: about 460 nm, see FIG. 3A) asexcitation light. Referring to FIG. 3A, reference numeral B denotes acolor light component which is emitted as excitation light (blue lightcomponent) from the first solid-state light source 24. The firstsolid-state light source 24 includes gallium nitride as a main componentand has a pn junction-type structure. The first solid-state light sourcemay not have a pn junction-type structure, but may have a double heterojunction-type structure, a quantum well junction-type structure, or thelike.

A reflecting layer (not shown) is formed between the first solid-statelight source 24 and the base 22. A blue light component emitted from thefirst solid-state light source toward the base 22 is reflected towardthe fluorescent layer 26 by the reflecting layer.

The fluorescent layer 26 is formed of a layer containing a(Y,Gd)₃(Al,Ga)₅O₁₂:Ce which is a YAG-based fluorescent material, and isdisposed in the illuminated region of the first solid-state light source24. The fluorescent layer 26 is most efficiently excited by a blue lightcomponent with a wavelength of about 460 nm. As shown in FIG. 3B, thefluorescent layer 26 converts a blue light component emitted from thefirst solid-state light source 24 and a third solid-state light source44 (which will be described below) to light including a red lightcomponent (the peak of light-emission intensity: about 610 nm), a yellowlight component (the peak of light-emission intensity: about 580 nm),and a green light component (the peak of light-emission intensity: about550 nm), and emits converted light. Referring to FIG. 3B, referencenumeral B denotes a color light component, which can be used as a redlight component, from among the light components emitted from thefluorescent layer 26. Reference numeral G denotes a color lightcomponent, which can be used as a green light component, from among thelight components emitted from the fluorescent layer 26. Referencenumeral Y denotes a color light component which is emitted as a yellowlight component from the fluorescent layer.

The seal member 28 is formed of transparent epoxy resin, and protectsthe first solid-state light source 24 and the fluorescent layer 26.

As shown in FIG. 1, the first collimation optical system 30 includes aconvex meniscus lens 32 which suppresses the spread of light from thefirst solid-state light source device 20, and a convex lens 34 whichparallelizes light from the convex meniscus lens 32. As a whole, thecollimation optical system 30 has a function to parallelize light fromthe first solid-state light source device 20.

As shown in FIG. 2B, the third solid-state light source device 40 is alight-emitting diode which has a base 42, a third solid-state lightsource 44, and a seal member 48, and emits a blue light component (seeFIG. 3C which will be described below). The third solid-state lightsource device 40 has lead wires and the like in addition to theabove-described constituent elements, but the lead wires and the likewill not be shown or described.

As shown in FIG. 3C, the third solid-state light source 44 emits a bluelight component (the peak of light-emission intensity: about 460 nm) asauxiliary excitation light. In FIG. 3C, reference numeral B denotes acolor light component which is emitted as a color light component (bluelight component) from the third solid-state light source 44.

The base 42, the third solid-state light source 44, and the seal member48 respectively have the same configuration as the base 22, the firstsolid-state light source 24, and the seal member 28, thus detaileddescription thereof will not be repeated.

As shown in FIG. 1, the third collimation optical system 50 includes aconvex meniscus lens 52 suppressing the spread of auxiliary excitationlight (blue light component) from the third solid-state light sourcedevice 40, and a convex lens 54 parallelizing auxiliary excitation light(blue light component) from the convex meniscus lens 52. As a whole, thethird collimation optical system 50 has a function to parallelizeauxiliary excitation light (blue light component) from the thirdsolid-state light source device 40. The third collimation optical system50 has an optical axis orthogonal to an optical axis of the firstcollimation optical system 30.

The dichroic mirror 60 is disposed in a region including an intersectionbetween the optical axis of the first collimation optical system 30 andthe optical axis of the third collimation optical system 50. Thedichroic mirror 60 is an auxiliary excitation light reflection opticalelement which directly transmits light which is converted by thefluorescent layer 26 and emitted from the fluorescent layer 26, andreflects auxiliary excitation light (blue light component) from thethird solid-state light source device 40 to input auxiliary excitationlight (blue light component) to the fluorescent layer 26 in an oppositedirection to a direction in which main excitation light (blue lightcomponent) from the first solid-state light source 24 is input.Specifically, the dichroic mirror 60 is a mirror which has a wavelengthselective transmission film formed on a substrate to reflect a bluelight component and to transmit a red light component, a green lightcomponent, and a yellow light component. In FIG. 1, reference numeral Bdenotes a blue light component which is reflected by the dichroic mirror60. In FIG. 1, a dotted-line arrow (see reference numeral R,G,Y) whichpasses through the dichroic mirror 60 denotes a red light component, agreen light component, and a yellow light component which transmit thedichroic mirror 60.

The dichroic mirror 60 reflects main excitation light (blue lightcomponent) having directly transmitted the fluorescent layer 26. Theblue light component having transmitted the dichroic mirror 60 isremoved outside the system. That is, the projector 1000 has a functionto remove main excitation light (blue light component) by the dichroicmirror 60.

The rod integrator optical system 70 includes a convex lens 72, a rodlens 74, and a convex lens 76.

The convex lens 72 focuses parallel light from the first collimationoptical system 30 and guides focused light to the incidence surface ofthe rod lens 74.

The rod lens 74 is a solid columnar lens. The rod lens 74 multiplyreflects light input from the incidence surface within the plane to makelight uniform, and emits light having a uniform in-plane light-emissionintensity distribution from the emission surface. As the rod lens, ahollow columnar lens, instead of a solid columnar lens, may be used.

The convex lens 76 substantially parallelizes light emitted from theemission surface of the rod lens 74, and guides relevant light to theimage forming regions of the liquid crystal light modulation devices400R and 400G.

The second illumination device 110 includes a second solid-state lightsource device 120, a collimation optical system 130, and a rodintegrator optical system 170.

As shown in FIG. 2C, the second solid-state light source device 120 is alight-emitting diode which has a base 122, a second solid-state lightsource 124, and a seal member 128, and emits a blue light component (seeFIG. 3C which will be described below). The second solid-state lightsource device 120 has lead wires and the like in addition to theabove-described constituent elements, but the lead wires and the likewill not be shown or described.

As shown in FIG. 3D, the second solid-state light source 124 emits bluelight component (the peak of light-emission intensity: about 460 nm) asa color light component. In FIG. 3D, reference numeral B denotes a colorlight component which is emitted as a color light component (blue lightcomponent) from the second solid-state light source 124.

The base 122, the second solid-state light source 124, and the sealmember 128 respectively have the same configuration as the base 22, thefirst solid-state light source 24, and the seal member 28, thus detaileddescription thereof will not be repeated.

The first solid-state light source 24, the third solid-state lightsource 44, and the second solid-state light source 124 are formed of thesame material by the same manufacturing method, and have the samestructure. For this reason, the first solid-state light source 24, thethird solid-state light source 44, and the second solid-state lightsource 124 have the same temperature characteristic, such that change inthe light amount with change in temperature is identical.

As shown in FIG. 1, the second collimation optical system 130 includes aconvex meniscus lens 132 suppressing the spread of the blue lightcomponent from the second solid-state light source device 120, and aconvex lens 134 parallelizing the blue light component from the convexmeniscus lens 132. As a whole, the second collimation optical system 130has a function to parallelize the blue light component from the secondsolid-state light source device 120.

The rod integrator optical system 170 includes a convex lens 172, a rodlens 174, and a convex lens 176.

The convex lens 172 focuses parallel light from the second collimationoptical system 130 and guides focused light to the incidence surface ofthe rod lens 174.

The rod lens 174 is a solid columnar lens. The rod lens 174 multiplyreflects light input from the incidence surface within the plane to makelight uniform, and emits light having a uniform in-plane light-emissionintensity distribution from the emission surface. As the rod lens, ahollow columnar lens, instead of a solid columnar lens, may be used.

The convex lens 176 substantially parallelizes light emitted from theemission surface of the rod lens 174, and guides relevant light to theimage forming region of the liquid crystal light modulation device 400B.

The color separating and guiding optical system 300 includes a dichroicmirror 310 which is disposed upstream of the optical path, a dichroicmirror 320 and a reflecting mirror 330 which are disposed downstream ofthe optical path, and a reflecting mirror 340 for a blue lightcomponent. The color separating and guiding optical system 300 has afunction to separate light from the first illumination device 10 into ared light component and a green light component, and to guide the colorlight components, the red light component and the green light component,to the liquid crystal light modulation devices 400R and 400G to beilluminated, and a function to guide the blue light component from thesecond illumination device 110 to the liquid crystal light modulationdevice 400B to be illuminated.

The dichroic mirrors 310 and 320 are mirrors which have a wavelengthselective transmission film formed on the substrate to reflect lighthaving a predetermined wavelength region and to transmit light havinganother wavelength region.

The dichroic mirror 310 is a dichroic mirror which reflects a greenlight component, and transmits a red light component and a yellow lightcomponent.

The dichroic mirror 320 is a dichroic mirror which reflects a red lightcomponent, and transmits a yellow light component. The yellow lightcomponent having transmitted the dichroic mirror 320 is removed outsidethe system. That is, the projector 1000 has a function to remove theyellow light component by the dichroic mirror 320. In FIG, 1, adotted-line arrow (see reference numeral Y) extending from the dichroicmirror 320 denotes the yellow light component having transmitted thedichroic mirror 320.

The reflecting mirror 330 is a reflecting mirror which reflects a greenlight component.

The red light component having transmitted the dichroic mirror 310 isreflected by the dichroic mirror 320, and is input to the image formingregion of the liquid crystal light modulation device 400R for a redlight component.

The green light component having been reflected by the dichroic mirror310 is further reflected by the reflecting mirror 330, and is input tothe image forming region of the liquid crystal light modulation device400G for a green light component.

The blue light component from the second illumination device 110 isreflected by the reflecting mirror 340, and is input to the imageforming region of the liquid crystal light modulation device 400B for ablue light component.

The liquid crystal light modulation devices 400R, 400G, and 400Bmodulate the input color light components in accordance with imageinformation to form a color image, and will be illuminated by the firstillumination device 10 and the second illumination device 110. Thoughnot shown, incidence-side polarizing plates are respectively disposedbetween the dichroic mirror 320 and the liquid crystal light modulationdevice 400R, between the reflecting mirror 330 and the liquid crystallight modulation device 400G, and between the reflecting mirror 340 andthe liquid crystal light modulation device 400B. Emission-sidepolarizing plates are respectively disposed between the liquid crystallight modulation devices 400R, 400G, and 400B and the cross dichroicprism 500. Light modulation of the respective input color lightcomponents is carried out by the incidence-side polarizing plates, theliquid crystal light modulation devices 400R, 400G, and 400B, and theemission-side polarizing plates.

The liquid crystal light modulation devices 400R, 400G, and 400B aretransmission-type liquid crystal light modulation devices in whichliquid crystal serving as an electro-optical material is sealed betweena pair of transparent glass substrates. For example, each of the liquidcrystal light modulation devices 400R, 400G, and 400B modulates thepolarization direction of one linearly polarized light emitted from thecorresponding incidence-side polarizing plate in accordance with a givenimage signal with a polysilicon TFT as a switching element.

The cross dichroic prism 500 is an optical element which combinesmodulated optical images for the respective color light componentsemitted from the emission-side polarizing plates to form a color image.The cross dichroic prism 500 is formed by bonding four rectangularprisms to each other and substantially has a square shape in plan view.A dielectric multilayer film is formed at an interface having asubstantially X shape of the bonded rectangular prisms. A dielectricmultilayer film formed at one interface having a substantially X shapereflects the red light component, and a dielectric multilayer filmformed at another interface reflects the blue light component. Thesedielectric multilayer films cause the red light component and the bluelight component to be bent and arranged in the traveling direction ofthe green light component, such that the three color light componentsare combined.

The color image emitted from the cross dichroic prism 500 is enlargedand projected by the projection optical system 600 to form an image on ascreen SCR.

Next, the effects of the projector 1000 according to the firstembodiment will be described.

According to the projector 1000 of the first embodiment, the two colorlight components (red light component and green light component) emittedfrom the first solid-state light source device 20 and one color lightcomponent (blue light component) emitted from the second solid-statelight source device 120 are used as the three color light components(red light component, green light component, and blue light component)which are modulated by the liquid crystal light modulation devices 400R,400G, and 400B. Therefore, the thermal load imposed on the respectivesolid-state light source devices can be reduced compared to a projectorwhich includes a single solid-state light source device. As a result,the projection image can be brightened compared to a projection whichincludes a single solid-state light source device.

According to the projector 1000 of the first embodiment, the two colorlight components (red light component and green light component) fromamong the three color light components (red light component, green lightcomponent, and blue light component) which are modulated by the liquidcrystal light modulation devices 400R, 400G, and 400B are generated byusing the common solid-state light source (first solid-state lightsource 24 and third solid-state light source 44). Therefore, the colorbalance of the projection image can be stabilized compared to aprojector which includes separate three solid-state light source devicesfor respective color light components.

As a result, the projector 1000 of the first embodiment can brighten theprojection image compared to a projector which includes a singlesolid-state light source device, and can stabilize the color balance ofthe projection image compared to a projector which includes separatethree solid-state light source devices for respective color lightcomponents.

According to the projector 1000 of the first embodiment, the firstsolid-state light source device 20 converts two kinds of excitationlight of main excitation light and auxiliary excitation light to lightincluding a red light component and a green light component, and emitsconverted light. Therefore, the projection image can be furtherbrightened.

The projector 1000 of the first embodiment includes the auxiliaryexcitation light reflection optical element (dichroic mirror 60)disposed in the region including the intersection between the opticalaxis of the first collimation optical system 30 and the optical axis ofthe third collimation optical system 50. Therefore, auxiliary excitationlight is input to the fluorescent layer 26 in the direction differentfrom the direction in which main excitation light is input.

According to the projector 1000 of the first embodiment, auxiliaryexcitation light which is converted to parallel light by the thirdcollimation optical system 50 is reflected as parallel light by theauxiliary excitation light reflection optical element (dichroic mirror60), is focused by the first collimation optical system 30, and isefficiently input to the light-emission region of the fluorescent layer26. Therefore, it is possible to suppress the spread of thelight-emission region due to the third solid-state light source device40 being further provided.

According to the projector 1000 of the first embodiment, main excitationlight and auxiliary excitation light are blue light components, thefirst color light component is a red light component, the second colorlight component is a green light component, and the third color lightcomponent is a blue light component. Therefore, light including a redlight component and a green light component can be emitted from thefirst solid-state light source device 20 by using the first solid-statelight source 24 and the third solid-state light source 44 emitting bluelight components.

According to the projector 1000 of the first embodiment, a green lightcomponent is generated by using the first solid-state light source 24and the third solid-state light source 44 (emitting blue lightcomponents together) which have high light-emission efficiency comparedto a solid-state light source which is used in a solid-state lightsource device emitting a green light component. Therefore,light-emission efficiency can be increased compared to a case where asolid-state light source device emitting a green light component isused.

According to the projector 1000 of the first embodiment, the firstsolid-state light source 24, the second solid-state light source 124,and the third solid-state light source 44 have the same temperaturecharacteristic. Therefore, with regard to all of the color lightcomponents, changes in the light amount with change in temperature aremade the same, such that the color balance of the projection image canbe further stabilized.

According to the projector 1000 of the first embodiment, the fluorescentlayer 26 is formed of a layer containing (Y,Gd)₃ (Al,Ga)₅O₁₂:Ce which isa YAG-based fluorescent material. Therefore, the projection image can befurther brightened, and a high-reliable projector can be obtained.

According to the projector 1000 of the first embodiment, the dichroicmirror 320 has a function to remove the yellow light component fromlight from the first solid-state light source device 20. Therefore, theyellow light component can be removed from light from the firstsolid-state light source device 20. As a result, color reproducibilitycan be prevented from being deteriorated due to the yellow lightcomponent.

According to the projector 1000 of the first embodiment, the dichroicmirror 60 has the function to remove main excitation light (blue lightcomponent) from light from the first solid-state light source device 20.Therefore, main excitation light (blue light component) can be removedfrom light from the first solid-state light source device 20. As aresult, it is possible to suppress degradation in color reproducibilityor deterioration of the light modulation device.

Second Embodiment

FIG. 4 is a plan view showing optical systems of a projector 1002according to a second embodiment.

The projector 1002 of the second embodiment basically has the sameconfiguration as the projector 1000 of the first embodiment, but a firstillumination device has the configuration different from that in theprojector 1000 of the first embodiment.

That is, in the projector 1002 of the second embodiment, as shown inFIG. 4, a first illumination device 12 further includes areflection-type polarizing plate 80 which is located at the back of thecollimation optical system 30 to directly transmit one polarizedcomponent (for example, s polarized component) from among polarizedcomponents included in light emitted from the first solid-state lightsource device 20 and to reflect another polarized component (forexample, p polarized component) toward the fluorescent layer 26. Thereflection-type polarizing plate 80 is a wire grid polarizing platewhich has fine metal wires disposed in a lattice shape at specificpitches. As the reflection-type polarizing plate, a polarization beamsplitter (PBS) having a dielectric multilayer film on a substrate may beused, instead of the wire grid polarizing plate. In FIG. 4, a solid-linearrow (see reference numeral R(p),G(p),Y(p)) extending from thereflection-type polarizing plate 80 denotes another polarized componentwhich is reflected by the reflection-type polarizing plate 80.

As described above, in the projector 1002 of the second embodiment, thefirst illumination device has the configuration different from that inthe projector 1000 of the first embodiment; however, the two color lightcomponents (red light component and green light component) emitted fromthe first solid-state light source device 20 and one color lightcomponent (blue light component) emitted from the second solid-statelight source device 120 are used as the three color light components(red light component, green light component, and blue light component)which are modulated by the liquid crystal light modulation devices 400R,400G, and 400B, and the two color light components (red light componentand green light component) from among the three color light components(red light component, green light component, and blue light component)which are modulated by the liquid crystal light modulation devices 400R,400G, and 400B are generated by using the common solid-state lightsource (first solid-state light source 24 and third solid-state lightsource 44). Therefore, similarly to the projector 1000 of the firstembodiment, the projection image can be brightened compared to aprojector which includes a single solid-state light source device, andthe color balance of the projection image can be stabilized compared toa projector which includes separate solid-state light source devices forrespective color light components.

According to the projector 1002 of the second embodiment, thereflection-type polarizing plate 80 is further provided. Thus, anotherpolarized component is returned again to the fluorescent layer 26 andreflected by the surface of the fluorescent layer 26, and part ofanother polarized component is converted to one polarized component andreused, such that light use efficiency can be improved, and consequentlythe projection image can be further brightened.

According to the projector 1002 of the second embodiment, thereflection-type polarizing plate 80 is located at the back of the firstcollimation optical system 30. Thus, another polarized component whichis converted to parallel light by the first collimation optical system30 is reflected as parallel light by the reflection-type polarizingplate 80, is focused by the first collimation optical system 30, and isefficiently input to the light-emission region of the fluorescent layer26. Therefore, it is possible to suppress the spread of thelight-emission region due to the reflection-type polarizing plate 80being provided.

The projector 1002 of the second embodiment has the same configurationas the projector 1000 of the first embodiment, excluding theconfiguration of the first illumination device. Therefore, the projector1002 of the second embodiment also has the relevant effects from amongthe effects of the projector 1000 of the first embodiment.

Third Embodiment

FIG. 5 is a plan view showing optical systems of a projector 1004according to a third embodiment.

The projector 1004 of the third embodiment basically has the sameconfiguration as the projector 1000 of the first embodiment, but a lightmodulation device and a color separating and guiding optical system havethe configuration different from those in the projector 1000 of thefirst embodiment.

That is, in the projector 1004 of the third embodiment, as shown in FIG.5, a light modulation device has reflection-type liquid crystal lightmodulation devices 402R, 402G, and 402B. A color separating and guidingoptical system is a color separating and guiding optical system 304. Thecolor separating and guiding optical system 304 has a dichroic mirror310 which reflects a green light component and transmits other colorlight components, and reflection-type polarizing plates 322, 332, and342 which directly transmit one polarized component (for example, spolarized component) and reflect another polarized component (ppolarized component). The reflection-type polarizing plate 322 alsofunctions as a dichroic mirror which reflects a yellow light componentand transmits a red light component. The reflection-type polarizingplate 322 is, for example, an optical element which has fine metal wiresserving as a wire grid polarizing plate disposed on one surface of thesubstrate in a lattice shape at specific pitches and has a wavelengthselective transmission film serving as a dichroic mirror on the othersurface of the substrate. That is, the projector 1004 has a function toremove a yellow light component by the reflection-type polarizing plate322.

The liquid crystal light modulation devices 402R, 402G, and 402B carryout light modulation of the respective input color light components,together with the reflection-type polarizing plates 322, 332, and 342 inthe color separating and guiding optical system 304. The colorseparating and guiding optical system 304 has a function to separatelight from the first illumination device 10 into a red light componentand a green light component, to guide the respective color lightcomponents, the red light component and the green light component, tothe liquid crystal light modulation devices 402R and 402G to beilluminated, and to guide the light components reflected by the liquidcrystal light modulation devices 402R and 402G to the cross dichroicprism 500 as modulated light components, and a function to guide theblue light component from the second illumination device 110 to theliquid crystal light modulation device 402B to be illuminated and toguide the light component reflected by the liquid crystal lightmodulation device to the cross dichroic prism 500 as modulated lightcomponent.

As described above, in the projector 1004 of the third embodiment, thelight modulation device and the color separating and guiding opticalsystem have the configuration different from those in the projector 1000of the first embodiment; however, the two color light components (redlight component and green light component) emitted from the firstsolid-state light source device 20 and one color light component (bluelight component) emitted from the second solid-state light source device120 are used as the three color light components (red light component,green light component, and blue light component) which are modulated bythe liquid crystal light modulation devices 402R, 402G, and 402B, andthe two color light components (red light component and green lightcomponent) from among the three color light components (red lightcomponent, green light component, and blue light component) which aremodulated by the liquid crystal light modulation devices 402R, 402G, and402B are generated by using the common solid-state light source (firstsolid-state light source 24 and third solid-state light source 44).Therefore, similarly to the projector 1000 of the first embodiment, theprojection image can be brightened compared to a projector which uses asingle solid-state light source device, and the color balance of theprojection image can be stabilized compared to a projector whichincludes separate solid-state light source devices for respective colorlight components.

The projector 1004 of the third embodiment has the same configuration asthe projector 1000 of the first embodiment, excluding the configurationof the light modulation device and the color separating and guidingoptical system. Therefore, the projector 1004 of the third embodimentalso has the relevant effects from among the effects of the projector1000 of the first embodiment.

Fourth Embodiment

FIG. 6 is a plan view showing optical systems of a projector 1006according to a fourth embodiment.

The projector 1006 of the fourth embodiment basically has the sameconfiguration as the projector 1000 of the first embodiment, but a firstillumination device and a second illumination device have theconfiguration different from those in the projector 1000 of the firstembodiment.

That is, in the projector 1006 of the fourth embodiment, as shown inFIG. 6, a first illumination device 14 includes a lens integratoroptical system 90, instead of the rod integrator optical system 70, anda second illumination device 112 includes a lens integrator opticalsystem 190, instead of the rod integrator optical system 170. The lensintegrator optical system 90 includes a first lens array 92, a secondlens array 94, and a superimposing lens 96. The lens integrator opticalsystem 190 includes a first lens array 192, a second lens array 194, anda superimposing lens 196.

As described above, in the projector 1006 of the fourth embodiment, thefirst illumination device and the second illumination device have theconfiguration different from those in the projector 1000 of the firstembodiment; however, the two color light components (red light componentand green light component) emitted from the first solid-state lightsource device 20 and one color light component (blue light component)emitted from the second solid-state light source device 120 are used asthe three color light components (red light component, green lightcomponent, and blue light component) which are modulated by the liquidcrystal light modulation devices 400R, 400G, and 400B, and the two colorlight components (red light component and green light component) fromamong the three color light components (red light component, green lightcomponent, and blue light component) which are modulated by the liquidcrystal light modulation devices 400R, 400G, and 400B are generated byusing the common solid-state light source (first solid-state lightsource 24 and third solid-state light source 44). Therefore, similarlyto the projector 1000 of the first embodiment, the projection image canbe brightened compared to a projector which includes a singlesolid-state light source device, and the color balance of the projectionimage can be stabilized compared to a projector which includes separatesolid-state light source devices for respective color light components.

The projector 1006 of the fourth embodiment has the same configurationof the projector 1000 of the first embodiment, excluding theconfiguration of the first illumination device and the secondillumination device. Therefore, the projector 1006 of the fourthembodiment also has the same effects as the effects of the projector1000 of the first embodiment.

Although the invention has been described on the basis of the foregoingembodiments, the invention is not limited to the foregoing embodiments.The invention may be carried out in various forms without departing fromthe scope and spirit of the invention. For example, the followingmodification may be made.

(1) Although in the foregoing embodiments, the fluorescent layer 26 isformed of a layer containing (Y,Gd)₃(Al,Ga)₅ O₁₂:Ce, the invention isnot limited thereto. For example, the fluorescent layer may be formed ofa layer containing a YAG-based fluorescent material other than(Y,Gd)₃(Al,Ga)₅O₁₂: Ce, a layer containing a silicate-based fluorescentmaterial, or a layer containing a TAG-based fluorescent material.Further, the fluorescent layer may be formed of a layer containing amixture of a fluorescent material which converts excitation light to ared light component and a fluorescent material which converts excitationlight to a green light component.

(2) Although in the foregoing embodiments, a liquid crystal lightmodulation device is used as a light modulation device for a projector,the invention is not limited thereto. As a light modulation device, ingeneral, any device may be used insofar as the device modulates incidentlight in accordance with image information. For example, amicromirror-type light modulation device or the like may be used. As amicro-mirror-type light modulation device, for example, DMD (DigitalMicromirror Device) (Trademark of TI Inc.) may be used.

(3) Although in the foregoing embodiments, the first solid-state lightsource device 20, the second solid-state light source device 120, andthe third solid-state light source device 40 are light-emitting diodes,the invention is not limited thereto. The first solid-state light sourcedevice, the second solid-state light source device, and the thirdsolid-state light source device may be, for example, semiconductor laseror organic light-emitting diodes.

(4) Although in the foregoing embodiments, main excitation light andauxiliary excitation light are both blue light components, the inventionis not limited thereto. For example, main excitation light and auxiliaryexcitation light may be both ultraviolet light. Further, main excitationlight may be one of a blue light component and ultraviolet light, andauxiliary excitation light may be the other one of the blue lightcomponent and ultraviolet light. With this configuration, lightincluding a red light component and a green light component can beemitted from the first illumination device, and light-emissionefficiency can be increased compared to a case where a solid-state lightsource device emitting a green light component is used. Further, theselection width of a fluorescent material in the fluorescent layer iswidened.

(5) In the foregoing embodiments, when main excitation light andauxiliary excitation light are both ultraviolet light, the first colorlight component may be a green light component, the second color lightcomponent may be a blue light component, and the third color lightcomponent may be a red light component. Further, the first color lightcomponent may be a red light component, the second color light componentmay be a blue light component, and the third color light component maybe a green light component.

(6) Although in the first, second, and fourth embodiments, the projectorhas a function to remove a yellow light component from the firstsolid-state light source device 20, the invention is not limitedthereto. For example, the projector may not have a function to remove ayellow light component. In this case, the yellow light componentincluded in light emitted from the first illumination device can bepositively used, such that a brighter projection image can be projected.Further, when the yellow light component is not removed, the yellowlight component is modulated by using a light modulation devicedifferent from that for a red light component or a green lightcomponent, such that a projection image having more excellent colorreproducibility can be projected, in addition to the above-describedeffects.

(7) In the foregoing embodiments, the projector may further include apolarization conversion device. The polarization conversion device is apolarization conversion element which converts light including onepolarized component and another polarized component to substantially onelinearly polarized light with polarization direction arranged.

(8) Although in the foregoing embodiments, each collimation opticalsystem includes two lenses of the convex meniscus lens and the convexlens, the invention is not limited thereto. For example, the collimationoptical system may include only one lens or may include three or morelenses.

(9) The shape of each of the lenses which are used in the optical pathof the projector in each of the foregoing embodiments is not limited tothose described in the foregoing embodiments. If necessary, lenseshaving various shapes may be used.

(10) Although in the foregoing embodiments, an example where a projectoruses three liquid crystal light modulation devices has been described,the invention is not limited to this example. The invention may beapplied to a projector which uses one, two, or four or more liquidcrystal light modulation devices.

(11) The invention may be applied to a front projection-type projectorwhich projects a projection image from an observation side, or a rearprojection-type projector which projects a projection image from anopposite side to the observation side.

The entire disclosure of Japanese Patent Application No: 2009-190761,filed Aug. 20, 2009 is expressly incorporated by reference herein.

What is claimed is:
 1. A projector comprising: a first solid-state lightsource device which includes a first solid-state light source emittingmain excitation light, and a fluorescent layer converting the mainexcitation light to light including a first color light component and asecond color light component different from the first color lightcomponent, and emitting converted light; a second solid-state lightsource device which includes a second solid-state light source emittinga third color light component different from the first color lightcomponent and the second color light component; a light modulationdevice modulating the first color light component, the second colorlight component, and the third color light component in accordance withimage information; a projection optical system projecting the modulatedlight components from the light modulation device as a projection image;and a third solid-state light source device which includes a thirdsolid-state light source emitting auxiliary excitation light, whereinthe fluorescent layer is configured such that the auxiliary excitationlight is input thereto in a direction different from a direction inwhich the main excitation light is input, and the fluorescent layer isconfigured to convert the auxiliary excitation light to light includingthe first color light component and the second color light component,and to emit the converted light.
 2. The projector according to claim 1,further comprising: a first collimation optical system parallelizinglight emitted from the first solid-state light source device; a secondcollimation optical system parallelizing light emitted from the secondsolid-state light source device; a third collimation optical systemhaving an optical axis orthogonal to an optical axis of the firstcollimation optical system and parallelizing the auxiliary excitationlight emitted from the third solid-state light source device; and anauxiliary excitation light reflection optical element disposed in aregion including an intersection between the optical axis of the firstcollimation optical system and the optical axis of the third collimationoptical system, wherein the auxiliary excitation light reflectionoptical element directly transmits light which is converted by thefluorescent layer and emitted from the fluorescent layer, and reflectsthe auxiliary excitation light from the third solid-state light sourcedevice to input the auxiliary excitation light to the fluorescent layerin an opposite direction to a direction in which the main excitationlight from the first solid-state light source is input.
 3. The projectoraccording to claim 2, further comprising: a reflection-type polarizingplate located at the back of the first collimation optical system todirectly transmit one polarized component from among polarizedcomponents included in light emitted from the first solid-state lightsource device and to reflect another polarized component toward thefluorescent layer.
 4. The projector according to claim 2, wherein themain excitation light and the auxiliary excitation light are blue lightcomponents, the first color light component is a red light component,the second color light component is a green light component, the thirdcolor light component is a blue light component, and the auxiliaryexcitation light reflection optical element is a mirror which reflectsthe blue color light component and transmits the red color lightcomponent, the green color light component and a yellow color lightcomponent, the yellow color light component included in light from thefirst solid-state light source device, and the mirror has a wavelengthselective transmission film.
 5. The projector according to claim 2,wherein the auxiliary excitation light reflection optical element is adichroic mirror to remove the main excitation light from light from thefirst solid-state light source device.
 6. The projector according toclaim 1, wherein the main excitation light and the auxiliary excitationlight are blue light components, the first color light component is ared light component, the second color light component is a green lightcomponent, and the third color light component is a blue lightcomponent.
 7. The projector according to claim 6, wherein the firstsolid-state light source, the second solid-state light source, and thethird solid-state light source have the same temperature characteristic.8. The projector according to claim 6, wherein the fluorescent layer isformed of a layer containing a YAG-based fluorescent material, asilicate-based fluorescent material, or a TAG-based fluorescentmaterial.
 9. The projector according to claim 1, wherein the mainexcitation light and the auxiliary excitation light are ultravioletlight, the first color light component is a red light component, thesecond color light component is a green light component, and the thirdcolor light component is a blue light component.
 10. The projectoraccording to claim 1, wherein the main excitation light is one of a bluelight component and ultraviolet light, the auxiliary excitation light isthe other one of the blue light component and the ultraviolet light, thefirst color light component is a red light component, the second colorlight component is a green light component, and the third color lightcomponent is a blue light component.
 11. The projector according toclaim 1, wherein a function is provided to remove a yellow lightcomponent from light from the first solid-state light source device. 12.The projector according to claim 1, wherein a function is provided toremove the main excitation light from light from the first solid-statelight source device.
 13. A projector comprising: a first solid-statelight source device which includes a first solid-state light sourceemitting main excitation light, and a fluorescent layer converting themain excitation light to light including a first color light componentand a second color light component different from the first color lightcomponent, and emitting converted light; a second solid-state lightsource device which includes a second solid-state light source emittinga third color light component different from the first color lightcomponent and the second color light component; a light modulationdevice modulating the first color light component, the second colorlight component, and the third color light component in accordance withimage information; a projection optical system projecting the modulatedlight components from the light modulation device as a projection image;and a third solid-state light source device which includes a thirdsolid-state light source emitting auxiliary excitation light, whereinthe fluorescent layer is configured to convert the auxiliary excitationlight to light including the first color light component and the secondcolor light component, and to emit the converted light.
 14. Theprojector according to claim 13, further comprising: a first collimationoptical system parallelizing light emitted from the first solid-statelight source device; a second collimation optical system parallelizinglight emitted from the second solid-state light source device; a thirdcollimation optical system having an optical axis orthogonal to anoptical axis of the first collimation optical system and parallelizingthe auxiliary excitation light emitted from the third solid-state lightsource device; and an auxiliary excitation light reflection opticalelement disposed in a region including an intersection between theoptical axis of the first collimation optical system and the opticalaxis of the third collimation optical system, wherein the auxiliaryexcitation light reflection optical element directly transmits lightwhich is converted by the fluorescent layer and emitted from thefluorescent layer, and reflects the auxiliary excitation light from thethird solid-state light source device to input the auxiliary excitationlight to the fluorescent layer in an opposite direction to a directionin which the main excitation light from the first solid-state lightsource is input.
 15. The projector according to claim 14, furthercomprising: a reflection-type polarizing plate located downstream of thefirst collimation optical system, the reflection-type polarizing platetransmitting a first polarized component of light emitted from the firstsolid-state light source device and reflecting a second polarizedcomponent of light emitted from the first solid-state light sourcetoward the fluorescent layer, the second polarized component differentfrom the first polarized component.
 16. The projector according to claim13, wherein the main excitation light is one of blue light andultraviolet light, the auxiliary excitation light is one of blue lightand ultraviolet light, the first color light component is a red lightcomponent, the second color light component is a green light component,and the third color light component is a blue light component.
 17. Theprojector according to claim 16, wherein the first solid-state lightsource, the second solid-state light source, and the third solid-statelight source have a same temperature characteristic.
 18. The projectoraccording to claim 13, wherein a function is provided to remove a yellowlight component from light from the first solid-state light sourcedevice.
 19. The projector according to claim 13, wherein a function isprovided to remove the main excitation light from light from the firstsolid-state light source device.